Law. the unlawful killing of a human being without malice aforethought.
the killing of a human being by another; homicide.

1250–1300; Middle English; see man1, slaughter

homicide, kill, manslaughter, murder (see synonym study at kill). Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
manslaughter (ˈmænˌslɔːtə)
1.  law Compare murder homicide See also malice aforethought the unlawful killing of one human being by another without malice aforethought
2.  (loosely) the killing of a human being

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

c.1300, from O.E. mannslæht (Anglian), mannslieht (W.Saxon), from man (q.v.) + slæht, slieht "act of killing." Etymologically identical with homicide, but in legal use usually distinguished from murder and restricted to "simple homicide."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary
manslaughter [(man-slaw-tuhr)]

The unlawful killing of a person, without malice or premeditation. Involuntary manslaughter is accidental, such as running into someone with a car. Voluntary manslaughter is committed in the “heat of passion,” as in a spontaneous fight in which one person is killed by a strong blow. Manslaughter is usually considered less serious than murder. Both murder and manslaughter are types of homicide.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Britannica


in Anglo-American criminal law, a category of criminal homicide that generally carries a lesser penalty than the crime of murder. Different legal systems use different criteria to distinguish the kinds and degrees of unjustified killing. See homicide.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
If widening the scope of manslaughter is about accountability, then it seems fit for purpose.
Giordano, opting instead for aggravated manslaughter.
He was acquitted of the more serious charge of manslaughter.
The driver of the cab, an electric-powered vehicle, was arrested and charged
  with manslaughter.
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